Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
doc thuc » hoc thuc, do thuc, hoc thuoc
trinh vi » trinh va, trinh ve, trinh viet
trong xa » trong xay, trong ca, trong xu
dinh vi » dinh ve, dinh viet, dinh tri
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ve doc » ve duoc, va doc, me doc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((tang xa) or (trong xa)) hoi. hieu ve doc thuc va ((dinh vi) or (trinh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((tang xa) OR (trong xa)) hoi. hieu ve doc thuc va ((dinh vi) OR (trinh vi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((tang xa) or (trong xa)) hoi. hieu ve doc thuc va ((dinh vi) or (trinh vi)) cau tren*.